Exciton states of quantum confined ZnO nanorods |
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Authors: | Sun Young Kim Yun Seon Yeon Seung Min Park Jeong Hyun Kim Jae Kyu Song |
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Institution: | aDepartment of Chemistry, Kyunghee University, 1 Hoegi-dong, Dongdaemoon-gu, Seoul 130-701, Republic of Korea;bSchool of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Republic of Korea |
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Abstract: | Photoluminescence (PL) of zinc oxide (ZnO) nanorods with an average thickness of 5 nm and a length of 30 nm is blue-shifted compared to the bulk due to quantum confinement effects. The exciton states remain relatively stable at a high carrier density due to a smaller exciton size and an enhanced exciton binding energy in the quantum confined nanorods, whereas the electron-hole plasma states are formed in the bulk at the similar carrier density. A linear dependence of the PL intensity on the excitation intensity also corroborates the assumption that the stable exciton states are responsible for the undisturbed emission at a high carrier density. |
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